Unit 2 Cleaning Day,blackboard,chair,desk,window,door,classroom,blackboard,desk,chair,window,door,door 门,Singing, singing, he is singing.,Dancing, dancing, he is dancing.,Running, running, they are running.,动词加ing表示正在进行,clean 把.弄干净,Lets clean the classroom,clean the window,Sally is cleaning the window.,clean the desk,Lily is cleaning the desks.,clean the chair,Yang Ming is cleaning the chair.,clean the door,Wang Tao is cleaning the door.,clean the blackboard,He is cleaning the blackboard.,stand 站,He is standing on a chair.,stand,She is standing on a chair.,They are cleaning the windows.,
